Simultaneous Photocatalytic Oxygen Production and Hexavalent Chromium Reduction in Ag3PO4/C3N4 S-scheme Heterojunction
Tao Yang; Pengke Deng; Lele Wang; Jie Hu*; Qinqin Liu*; Hua Tang*
1School of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China 2School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China
Simultaneous Photocatalytic Oxygen Production and Hexavalent Chromium Reduction in Ag3PO4/C3N4 S-scheme Heterojunction
Tao Yang; Pengke Deng; Lele Wang; Jie Hu*; Qinqin Liu*; Hua Tang*
1School of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China 2School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China
The low separation efficiency of the photogenerated charges has always been an obstacle in practical application of semiconduc-tor-photocatalysts. S-scheme heterojunction is expected to break the barrier and achieve high photocatalytic activity by boosting the charge separation. Herein, a novel Ag3PO4/C3N4 heterojunction was successfully synthesized by in-situ coupling Ag3PO4 particle with C3N4 hollow spheres via a precipitation method. The Ag3PO4/C3N4 heterojunction could synchronously realize high photocatalytic oxygen production and hexavalent chromium reduction. The charge transfer of the composite follows the S-scheme charge transfer routes driven by the formed internal electric field, which accele-rates the photogenerated carrier separation and retains high photoredox ability. The optimized composite affords a high oxygen production rate of 803.31 µmol·g-1·h-1 and 87.9% conversion of Cr(VI). In addition, employing the C3N4 hollow spheres as reduction semiconductor in the S-scheme heterojunction will afford higher reaction efficiency than the C3N4 tube, C3N4 bulk and C3N4 sheet, which indicates that the hollow sphere structure of C3N4 provides more active sites and adsorption sites for boosting the photocatalytic activity. This work illustrates an applicable strategy to develop high-efficient dual functional-photocatalyst toward clean energy conversion and environmental protection.
The low separation efficiency of the photogenerated charges has always been an obstacle in practical application of semiconduc-tor-photocatalysts. S-scheme heterojunction is expected to break the barrier and achieve high photocatalytic activity by boosting the charge separation. Herein, a novel Ag3PO4/C3N4 heterojunction was successfully synthesized by in-situ coupling Ag3PO4 particle with C3N4 hollow spheres via a precipitation method. The Ag3PO4/C3N4 heterojunction could synchronously realize high photocatalytic oxygen production and hexavalent chromium reduction. The charge transfer of the composite follows the S-scheme charge transfer routes driven by the formed internal electric field, which accele-rates the photogenerated carrier separation and retains high photoredox ability. The optimized composite affords a high oxygen production rate of 803.31 µmol·g-1·h-1 and 87.9% conversion of Cr(VI). In addition, employing the C3N4 hollow spheres as reduction semiconductor in the S-scheme heterojunction will afford higher reaction efficiency than the C3N4 tube, C3N4 bulk and C3N4 sheet, which indicates that the hollow sphere structure of C3N4 provides more active sites and adsorption sites for boosting the photocatalytic activity. This work illustrates an applicable strategy to develop high-efficient dual functional-photocatalyst toward clean energy conversion and environmental protection.
基金资助:This work is supported by the National Natural Science Founda-tion of China (21975110, 21972058 and 22102064), and Prof. H. Tang gratefully acknowledges the financial support from Taishan Youth Scholar Program of Shandong Province.
通讯作者:
Jie Hu*; Qinqin Liu*; Hua Tang*
E-mail: huatang79@163.com; hujiechem@hotmail.com and qqliu@ujs.edu.cn
引用本文:
Tao Yang; Pengke Deng; Lele Wang; Jie Hu*; Qinqin Liu*; Hua Tang*. Simultaneous Photocatalytic Oxygen Production and Hexavalent Chromium Reduction in Ag3PO4/C3N4 S-scheme Heterojunction[J]. 结构化学, 2022, 41(6): 2206023-2206030.
Tao Yang; Pengke Deng; Lele Wang; Jie Hu*; Qinqin Liu*; Hua Tang*. Simultaneous Photocatalytic Oxygen Production and Hexavalent Chromium Reduction in Ag3PO4/C3N4 S-scheme Heterojunction. CHINESE JOURNAL OF STRUCTURAL CHEMISTRY, 2022, 41(6): 2206023-2206030.
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